A $6.20 billion portfolio backed largely by jumbo mortgages originated in recent years was sold last week, according to Interactive Data. The portfolio appears to have been sold by Premium Point Investments, though the hedge fund wouldn’t confirm that. Premium Point backed WinWater Home Mortgage, which stopped issuing jumbo mortgage-backed securities earlier this year. Impac Mortgage Holdings announced this week an offering of 2.5 million shares ... [Includes two briefs]